Remove bass signals

i dnt know , how to check that?

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Look at the sub, may be listed on it or look up the model number and find it on line.

All half-decent audio systems that use a sub-woofer have an active lowpass filter feeding the sub-woofer amplifier and active highpass filters feeding the stereo amplifier.
Then the sub-woofer is not fed higher frequencies and the stereo speakers are not fed very low damaging frequencies.

Passive filters would be huge and expensive.

"Satellite" speakers are not full-range because they are too small. They are more like tweeters. Their bass response drops at maybe 400Hz. Then the "sub-woofer" must perform all the woofer frequencies in addition to the sub-woofer frequencies.

A simple capacitor feeding the input resistance of the amplifier is a very simple filter with a very gradual slope of only 6dB/octave. Most audio filters are active and are 12dB/octave or 18dB/octave which have much steeper slopes.

as jack asked in post #14 what is that green "thing"? What kind of capacitor is that? Is it possible to filter bass using it?

as jack asked in post #14 what is that green "thing"? What kind of capacitor is that?

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Its a Mylar Capacitor.

Is it possible to filter bass using it?

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Any kind of cap can be used to filter bass. as long as it is the right capacity.

4pyros said:

Its a Mylar Capacitor.

Any kind of cap can be used to filter bass. as long as it is the right capacity.

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got it pyro, thank you and do these capacitors have polarity? I got plenty of them from an old amplifier.

The "green cap" is an Oriental metalized plastic film type which is similar to a European one that is boxed. Its value is marked "103" which is 10,000pF, 0.01uf or 10nF. Its tolerance is marked with a letter where J is 5%, K is 10% and M is 20%.
The same value for a European metalized plastic film capacitor would be marked "10n" then the same letter for the tolerance.

Since it is just a capacitor that feeds a resistor then the filter slope is a very gradual 6dB/octave.

EDIT: A metalized plastic film capacitor is not polarized.

Here is a photo of some European metalized plastic film capacitors: